William g



(Mod BL) W. G. MUMMA.

LOOK.

No. 331,995. Patented Dec. 8, 188,5.

WITNESSES: WDWENTOR: Y @i) ATTORNEYS.

N. PETERs. Fhalobthog'nphar. Wnhin tun. D. (L

I UNITED STATES PATENT OFFICE.

WILLIAM G. MUMMA, OF WARRENSBURG, MISSOURI.

LOCK.

SPECIFICATION forming part of Letters Patent No. 331,995, dated December 8, 1885. Application filed September 8, 1885. Serial No. 176,511. (ModeL) To all whom, it may concern.-

Be it known that I, WVILLIAM GARRISON MUMMA, of Warrensburg, in the county of Johnson and State of Missouri, have invented a new and Improved Lock, of which the following is a full, clear, and exact description.

My invention relates to looks more particularly designed for use on barn and smoke-house doors, but applicable to other structures.

The object ofthe invention is to provide a lock of simple, inexpensive, and durable construction, and one which shall be easy to operate, and affords a secure fastening.

The invention consists in certain novel features of construction and combinations of parts of the look, all as hereinafter fully described and claimed.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a front view of my improved lock with the case partly broken away and in section. Fig. 2 is a rear view of the lock with the inner plate of the case removed. Fig. 3 is a cross-section of the lock, taken on the line a: 00, Fig. 2, and shows also a part of the door to which the lock is attached, and Fig. 4 is a horizontal section through the catch-plate of the lock.

The letter A indicates the main case of the lock, which has an inner or back plate, a, having one beveled edge, a, which fits into an undercut or half-dovetailed recess at the top of the case A, and at its other edge, a", the plated rests in a rabbet formed along the case, so that when the plate a is set into the upper dovetailed recess of the case a couple of screws may be passed through the plate near its edge a into holes a of the case to hold the plate to place.

As best seen in Fig. 3, the back edges of the case A, which rest against the door B, are undercut, so that the bolts b b, when passed through holes I) b of the lock-case into the door, will draw the extreme back edges, a, of the case so closely to the door as to exclude water from behind the lock. The inner back plate, a, is set forward clear of the door, as shown.

When the lock is applied to barn or smokehouse doors, it will be placed, preferably, on the outside of the door, and with the heads of the bolts 12 b on the outside of the lock-case and the nuts of the bolts on the inside of the door, to make a secure fastening for the case.

The letter 0 indicates the bolt,which is fitted to slide in the upper part of the lock-case A, and is provided with projecting pins or studs 0 0, between which the stem (1 of the tumbler D passes, said tumbler being fixed by a key, 0, or otherwise to the spindle E, which has a knob, F, by which it may be turned for drawing back the bolt, as in Fig. 2, or shooting it into the catch-plate G, as in Fig. 1..

The tumbler D is formed with the segmental block d,the curved shoulder d of which extends beneath the bolt 0, and holds or clamps the bolt, to prevent it from being moved by the rattling of the door, whether the bolt be withdrawn or projected.

I make the catch-plate Gwith a bolt-receiving recess, 9, in its body portion, and with a face-flange, 9, having a hole for a headed bolt, 9 which may be passed through the doorcasing, so as to receive a nut, y on the inside of the casing, and the catch-plate also has a rearwardly-extending lip or flange, at its forward or outer edge, through which flange a screw, as at 9 may be passed into the doorjamb, and thus provide a strong fastening for the catch-plate.

The letter H indicates a dog, which is pivoted at h in the loclccase, and may fall at its back end by gravity alone; but I prefer to use a spring, as at h, to give it a positive downward movement. This dog H preferably has an inclined shoulder, 1, which stops against a shoulder, 2, on the lock-case A when the dog is raised so that its shoulder 3 engages behind the beveled corner 0' of the bolt 0 when the bolt is projected, and at this time the pawl I, which is pivoted to the lock-case at 13, is forced forward by a spring, J, fixed in the case, so that the upper end of the pawl will enter a notch, 4, in the lower back part of the dog H, to prevent the dog from falling, and consequently lock the bolt C, projected into the catch-plate G, as indicated in Fig. 1.

To allow the bolt 0 to be thrown, the key K will be passed through the key-hole made in the outside plate of the lock-case, in

position to allow the bit 7c of the key to act upon the dog H and pawl L to lock and unlock the bolt 0, as next described.

We will suppose the bolt G is withdrawn from the catch-plate or unlocked, as in Fig. 2. To fasten the door, the bolt 0 will be shot into the catch-plate, and the key K will be passed into the lock, and will be turned so that the end of its bit 70 will act on the lug 5 at the under side of the dog H, and will lift the dogshoulder 3 behind the end of the bolt at c, and as the dog is fully raised the spring J throws the pawl I into the dognotch 4, to

hold the dog raised to prevent withdrawal of the bolt from the catch-plate, as in Fig. 1.

When the door is fastened and the lock is to be unlocked, the key K first will be passed into the lock, and will be turned against the pawl I to force it back and out of the dognotch 4., so as to allow the spring h to force the dog H down from behind the bolt 0, and so that the extremity of the dog will fall in front of the pawl I to hold the pawl back, and by turning the knob F the bolt may be withdrawn from the catch-plate, as shown in Fig. 2.

My improved lock can be made right or left handed, as desired, and by suitably arranging the case the lock mechanism will serve equally well for mortise as for rim locks.

It will be noticed that around the spindle E the case A has a strengthening projection or boss, as at a and the shoulder f of the knob F rests against the boss, and the spindle has a bearing in the inner plate, a, so that it will be difficult to break the knob from the spindle or to break the lock-case by side pressure on the knob.

There are shoulders m min the lock-case, against which the pins 0 cof the bolt 0 strike to limit the throw of the bolt in both directions.

All parts of the lock may be made of cast metal, except the springs; hence the'lock can be made very cheaply, and will be effective and durable as'a fastening.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination, with the sliding bolt, of a tumbler having a bit for throwing the bolt, and a projection or block having shoulders adapted to .rest against said sliding bolt and prevent its being shaken out of place either in its thrown or retracted position, substantially as set forth.

2. The combination, with the lock-case having a beveled shoulder at its rear end, of a shouldered dog pivoted at one end below the bolt for locking the same, and having its free end beveled and adapted to abut against the beveled shoulder on the lock-case, the lockingpawl below and at right angles to the said dog, and a spring acting to throw the free end of the pawl into engagement with the dog, the dog and pawl both being in the path traversed by the key to the lock, substantially as set forth.

3. lhe cast-metal case A ofthe lock, formed with its upper and lower sides inclined out-- ward and toward each other attheir outer edges, the inner edges of the said sides being beveled outward from their inner sides, as

shown at (1*, the upper side having an undercut groove in its inner face, and the lower side having a rabbet, a and the back plate, a, fitting in the undercut groove and rabbet, substantially as set forth.

WVILLIAM G. MUMMA.

Witnesses: I

J os. H. BURNETT, I. B. EVANS. 

